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A gastric bypass seems like a simple solution to losing lots of weight. However, there are significant dietary changes you'll need to make after the procedure — it doesn't miraculously solve your eating problems. Here some information about post-surgical eating:

After weight-loss surgery, you get full faster, and you don't absorb nutrients as well. This can cause nausea, abdominal pain, diarrhea, and vomiting if you eat too much food at once, or if you eat foods that are high in fat or glucose. For the first three to six months after surgery, patients go through four distinct diet stages, starting with a no-added-glucose clear liquid diet to three meals and one or two snacks a day.

It's also common to develop lactose (milk) intolerance and vitamin and mineral deficiencies after surgery. Anemia can result from poor absorption of vitamin B12 and iron in menstruating women. Decreased calcium absorption may increase your risk of osteoporosis. You must take iron, calcium, and vitamin B12 supplements daily for the rest of your life. Some people have difficulty eating certain foods, such as red meat, bread, or pasta. Other people can eat all foods, including sweets, although they may experience changes in the way foods taste and no longer desire them. An experienced health care team must oversee your transition to whole foods and find the right levels of vitamin and calcium supplements. Also, you can gain weight if you drink high-calorie beverages and graze on small portions of food all day. You need to take responsibility for your eating habits for a lifetime if you want to keep the weight off.